Warning: gory imagery in post. It
is a horror forum, after all.
I've read one
book on the subject, and it was great. I wasn't particularly into "Ripperology" before I read this, but I really enjoyed it .... if "enjoy" is the right word. Though I've been refreshing my knowledge with wikipedia, and you could make yourself a Ripper expert within a few hours there. Enticement: the victim's pages have pictrues... Warning: the victims pages have pictures...
I think it would be tricky to exsaguinate someone without sanguinating your own clothes. Plus, IIRC, there wasn't a lack of blood at the scene, just a lack of blood on anyone wandering around Whitechapel at the time. What is odd is that the murders and subsequent mutilations occurred in areas with people around. One of the bodies was found in a square that was on the regular patrol of a bobby. He walked through the square and it was clean, then he walked through 20 minutes later and there was a woman with her face chopped up and her intestines placed above her shoulder. If JTR were some sort of evil genius it seems like he would have chosen more secluded sites. So it seems more like he was a very lucky lunatic. At least he could have hung around before he went hunting to see if a police officer might happen by. Then again, he might have studied the officer's route, brought the girl there right after the officer left, and known he had 20 minutes to get the job done. The officer reported hearing fleeing footsteps, so apparently Jack was cutting it close. (Cutting. haha).
But no one was every in hot pursuit of Jack. So I don't think he would have need to climb a wall; he just blended in with everyone on the street...or was soaked in blood and stuck to back allies and was miraculously not spotted. But people of Victorian Whitechapel weren't lifting their pinkies when they sipped tea. They were hoodlums, thieves, prostitutes, drunks, etc. Maybe JTR could blend in easier with these folks.